Graphene concentrated solution and preparation method therefor

A graphene dispersion and graphene technology, applied in the field of preparation of graphene concentrate, can solve the problems of low efficiency and high cost, and achieve the effect of simple steps, less water and obvious effect

Inactive Publication Date: 2015-08-26
ZHEJIANG TAISUO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also methods for preparing few-layer or single-layer graphene in the prior ar

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1

[0023] A method for preparing graphene concentrate. First, the aqueous titanate bis(dioctyloxy pyrophosphate) ethylene titanate solution is dissolved in water. The dissolution process is mechanically stirred at a speed of 50 Rpm, stirring time is 5 minutes, temperature is 10℃, then add graphene powder with length and width of 1~200 microns and thickness of 6~10nm, water-based titanate bis(dioctyloxy coke) The mass of phosphate-based) ethylene titanate is 2% of the mass of graphene powder. The ultrasonic dispersion is carried out in a magnetic field with a magnetic field strength of 0.5T. The ultrasonic frequency of the ultrasonic dispersion is 20KHz, the power is 1 kW, and the ultrasonic dispersion time It is 30 minutes and the temperature is controlled to 10°C to obtain a graphene dispersion. The mass fraction of graphene powder in the graphene dispersion is 0.5%; then the graphene is dispersed under the action of an external magnetic field with a magnetic fie...

Example Embodiment

[0024] Example 2

[0025] A method for preparing graphene concentrate, first dissolve the aqueous titanate bis(dioctyloxypyrophosphate) ethylene titanate and triethanolamine chelate (model 311W) solution in water, and the dissolved The process is by means of mechanical stirring, the rotation speed is 100 rpm, the stirring time is 30 minutes, the temperature is 35°C, and then graphene powder with a length and a width of 1 to 200 microns and a thickness of 6 to 10 nanometers are added. The mass of the aqueous titanate bis(dioctyloxypyrophosphate) ethylene titanate and triethanolamine chelate solution is 1.5% of the mass of the graphene powder, and it is ultrasonicated in a magnetic field with a magnetic field strength of 5T Dispersion, the ultrasonic frequency of the ultrasonic dispersion is 30KHz, the power is 5 kW, the ultrasonic dispersion time is 90 minutes, and the temperature is controlled at 60°C to obtain the graphene dispersion. The mass fraction of the graphene powder in ...

Example Embodiment

[0026] Example 3

[0027] A method for preparing graphene concentrate. First, the aqueous titanate bis(dioctyl pyrophosphate) glycolate titanate is dissolved in water. The dissolution process is by mechanical stirring at a speed of 80 revolutions. / Min, stirring time is 20 minutes, temperature is 30℃, then add graphene powder with length and width of 1~200 microns and thickness of 6~10nm, water-based titanate bis(dioctyl pyrophosphate ) The mass of glycolate titanate is 1.5% of the mass of graphene powder. The ultrasonic dispersion is carried out in a magnetic field with a magnetic field strength of 2T. The ultrasonic frequency of the ultrasonic dispersion is 10KHz, the power is 3 kW, and the ultrasonic dispersion time is 50 Minutes, the temperature is controlled to 20℃, the graphene dispersion is obtained. The mass fraction of the graphene powder in the graphene dispersion is 6%; then under the action of an external magnetic field with a magnetic field strength of 5T, the graphe...

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Abstract

The invention relates to a graphene concentrated solution and a preparation method therefor. Firstly, water-soluble titanate is dissolved in water; then, graphene is added, a graphene dispersion solution is subjected to ultrasonic treatment in a magnetic field, and thus water-soluble titanate can be used for carrying out full surface modification on graphene in the water so as to achieve the effect of full dispersion for graphene; and finally, the graphene dispersion solution is subjected to distillation or reduced-pressure distillation in an externally-applied magnetic field, thereby preparing the graphene concentrated solution. The graphene concentrated solution is low in moisture content and high in graphene content, so that performance degradation caused by the fact that excess moisture is introduced during use is avoided; the number of active groups of the surface of graphene is increased due to modification by water-soluble titanate, so that the bonding force of graphene to other materials is increased; and modified graphene are not subjected to an agglomeration phenomenon, so that fully-stripped graphene can better exert the properties such as high strength, electrical conductivity, thermal conductivity and the like of graphene. By the method disclosed by the invention, the dispersity of graphene and the performance of products can be further improved.

Description

technical field [0001] The invention belongs to the technical field of graphene new materials, and relates to a graphene concentrated liquid and a preparation method thereof, in particular to a graphite surface-modified graphene with water-based titanate in water and ultrasonically treated graphene in a magnetic field Graphene dispersion liquid, and the preparation method of the graphene concentrated liquid that distills graphene dispersion liquid or underpressure distillation in external magnetic field. Background technique [0002] At present, graphene is widely used, but due to the small particle size of graphene, the smallest graphene length is only about 1 micron, which makes graphene very prone to agglomeration when it is used. The occurrence of agglomeration is not only It will have a great impact on product performance, and on the other hand, it will greatly increase the amount of graphene used, resulting in an increase in cost. [0003] Graphene usually needs to be...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 毛惠敏陆炅石建华
Owner ZHEJIANG TAISUO TECH
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